Re: 73 evinrude 6 h.p. gas/oil mixture?
Champion J6J was the original plug number. The new Champion number is J6C, (most places stock it as Champion #823). Most auto parts stores either have, or can get them, for about $2 each. Original gap is .030" for normal use, if you'll be trolling you might want to increase the gap to .035" to reduce oil fouling.